/// <summary>
/// The update models.
/// </summary>
private void UpdateModels()
{
WizardItemCollection items = new WizardItemCollection(this.Items.OfType <WizardItem>());
// Remove any models that no longer exist.
foreach (WizardItemModel model in this.models.ToList())
{
if (!items.Contains(model.Id))
{
if (model.Parent != null)
{
model.Parent.Children.Remove(model);
model.Parent = null;
}
this.models.Remove(model);
}
}
// Set up new models.
foreach (WizardItem item in items)
{
if (item.Model == null)
{
WizardItemModel model = new WizardItemModel()
{
BackCommand = this.BackCommand,
ForwardCommand = this.ForwardCommand,
SelectCommand = this.SelectCommand
};
item.Model = model;
this.models.Add(model);
}
}
// Update the model tree structure.
foreach (WizardItemModel model in this.models)
{
if (model.ParentId == null)
{
model.Parent = null;
}
else
{
WizardItemModel parent = this.models.First(x => string.Equals(x.Id, model.ParentId));
if (!parent.Children.Contains(model))
{
parent.Children.Add(model);
}
model.Parent = parent;
}
}
}
/// <summary>
/// The on wizard item parent changed.
/// </summary>
/// <param name="sender"> The sender. </param>
/// <param name="e"> The event Arguments. </param>
protected virtual void OnWizardItemParentChanged(object sender, RoutedEventArgs e)
{
WizardItem wizardItem = (WizardItem)sender;
WizardItemCollection items = new WizardItemCollection(this.Items.OfType <WizardItem>());
WizardItemModel model = wizardItem.Model;
WizardItemModel oldParent = wizardItem.Model.Parent;
// Disconnect from old parent.
if (oldParent != null)
{
oldParent.Children.Remove(model);
model.Parent = null;
}
// Connect to new parent.
if ((wizardItem.ParentId != null) && items.Contains(wizardItem.ParentId))
{
WizardItemModel newParent = items[wizardItem.ParentId].Model;
newParent.Children.Add(model);
model.Parent = newParent;
}
}